What does it do? For every CDS association _assoc>> of a path expression> of a ABAP_CDS_V1_VIEW >, attributes for this part of the path expression can be defined in square brackets [ ] >. The following attributes can be specified:
With 1$|*:>>, the cardinality> of the section can be specified.
With INNER$|${LEFT OUTER$}> > the join type> can be specified.
With $[WHERE$] cds_cond> > a filter condition cds_cond> can be specified.